2 Unix SMB/CIFS implementation.
4 Handle user credentials (as regards krb5)
6 Copyright (C) Jelmer Vernooij 2005
7 Copyright (C) Tim Potter 2001
8 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/kerberos.h"
26 #include "system/gssapi.h"
27 #include "auth/kerberos/kerberos.h"
28 #include "auth/credentials/credentials.h"
29 #include "auth/credentials/credentials_internal.h"
30 #include "auth/credentials/credentials_proto.h"
31 #include "auth/credentials/credentials_krb5.h"
32 #include "auth/kerberos/kerberos_credentials.h"
33 #include "auth/kerberos/kerberos_srv_keytab.h"
34 #include "auth/kerberos/kerberos_util.h"
35 #include "auth/kerberos/pac_utils.h"
36 #include "param/param.h"
38 static void cli_credentials_invalidate_client_gss_creds(
39 struct cli_credentials
*cred
,
40 enum credentials_obtained obtained
);
42 _PUBLIC_
int cli_credentials_get_krb5_context(struct cli_credentials
*cred
,
43 struct loadparm_context
*lp_ctx
,
44 struct smb_krb5_context
**smb_krb5_context
)
47 if (cred
->smb_krb5_context
) {
48 *smb_krb5_context
= cred
->smb_krb5_context
;
52 ret
= smb_krb5_init_context(cred
, lp_ctx
,
53 &cred
->smb_krb5_context
);
55 cred
->smb_krb5_context
= NULL
;
58 *smb_krb5_context
= cred
->smb_krb5_context
;
62 /* For most predictable behaviour, this needs to be called directly after the cli_credentials_init(),
63 * otherwise we may still have references to the old smb_krb5_context in a credential cache etc
65 _PUBLIC_ NTSTATUS
cli_credentials_set_krb5_context(struct cli_credentials
*cred
,
66 struct smb_krb5_context
*smb_krb5_context
)
68 if (smb_krb5_context
== NULL
) {
69 talloc_unlink(cred
, cred
->smb_krb5_context
);
70 cred
->smb_krb5_context
= NULL
;
74 if (!talloc_reference(cred
, smb_krb5_context
)) {
75 return NT_STATUS_NO_MEMORY
;
77 cred
->smb_krb5_context
= smb_krb5_context
;
81 static int cli_credentials_set_from_ccache(struct cli_credentials
*cred
,
82 struct ccache_container
*ccache
,
83 enum credentials_obtained obtained
,
84 const char **error_string
)
91 if (cred
->ccache_obtained
> obtained
) {
95 ret
= krb5_cc_get_principal(ccache
->smb_krb5_context
->krb5_context
,
96 ccache
->ccache
, &princ
);
99 (*error_string
) = talloc_asprintf(cred
, "failed to get principal from ccache: %s\n",
100 smb_get_krb5_error_message(ccache
->smb_krb5_context
->krb5_context
,
105 ret
= krb5_unparse_name(ccache
->smb_krb5_context
->krb5_context
, princ
, &name
);
107 (*error_string
) = talloc_asprintf(cred
, "failed to unparse principal from ccache: %s\n",
108 smb_get_krb5_error_message(ccache
->smb_krb5_context
->krb5_context
,
113 cli_credentials_set_principal(cred
, name
, obtained
);
117 krb5_free_principal(ccache
->smb_krb5_context
->krb5_context
, princ
);
119 /* set the ccache_obtained here, as it just got set to UNINITIALISED by the calls above */
120 cred
->ccache_obtained
= obtained
;
125 /* Free a memory ccache */
126 static int free_mccache(struct ccache_container
*ccc
)
128 krb5_cc_destroy(ccc
->smb_krb5_context
->krb5_context
, ccc
->ccache
);
133 /* Free a disk-based ccache */
134 static int free_dccache(struct ccache_container
*ccc
) {
135 krb5_cc_close(ccc
->smb_krb5_context
->krb5_context
, ccc
->ccache
);
140 _PUBLIC_
int cli_credentials_set_ccache(struct cli_credentials
*cred
,
141 struct loadparm_context
*lp_ctx
,
143 enum credentials_obtained obtained
,
144 const char **error_string
)
147 krb5_principal princ
;
148 struct ccache_container
*ccc
;
149 if (cred
->ccache_obtained
> obtained
) {
153 ccc
= talloc(cred
, struct ccache_container
);
155 (*error_string
) = error_message(ENOMEM
);
159 ret
= cli_credentials_get_krb5_context(cred
, lp_ctx
,
160 &ccc
->smb_krb5_context
);
162 (*error_string
) = error_message(ret
);
166 if (!talloc_reference(ccc
, ccc
->smb_krb5_context
)) {
168 (*error_string
) = error_message(ENOMEM
);
173 ret
= krb5_cc_resolve(ccc
->smb_krb5_context
->krb5_context
, name
, &ccc
->ccache
);
175 (*error_string
) = talloc_asprintf(cred
, "failed to read krb5 ccache: %s: %s\n",
177 smb_get_krb5_error_message(ccc
->smb_krb5_context
->krb5_context
,
183 ret
= krb5_cc_default(ccc
->smb_krb5_context
->krb5_context
, &ccc
->ccache
);
185 (*error_string
) = talloc_asprintf(cred
, "failed to read default krb5 ccache: %s\n",
186 smb_get_krb5_error_message(ccc
->smb_krb5_context
->krb5_context
,
193 talloc_set_destructor(ccc
, free_dccache
);
195 ret
= krb5_cc_get_principal(ccc
->smb_krb5_context
->krb5_context
, ccc
->ccache
, &princ
);
198 krb5_free_principal(ccc
->smb_krb5_context
->krb5_context
, princ
);
199 ret
= cli_credentials_set_from_ccache(cred
, ccc
, obtained
, error_string
);
202 (*error_string
) = error_message(ret
);
207 cred
->ccache_obtained
= obtained
;
208 talloc_steal(cred
, ccc
);
210 cli_credentials_invalidate_client_gss_creds(cred
, cred
->ccache_obtained
);
217 * Indicate the we failed to log in to this service/host with these
218 * credentials. The caller passes an unsigned int which they
219 * initialise to the number of times they would like to retry.
221 * This method is used to support re-trying with freshly fetched
222 * credentials in case a server is rebuilt while clients have
223 * non-expired tickets. When the client code gets a logon failure they
224 * throw away the existing credentials for the server and retry.
226 _PUBLIC_
bool cli_credentials_failed_kerberos_login(struct cli_credentials
*cred
,
227 const char *principal
,
230 struct ccache_container
*ccc
;
231 krb5_creds creds
, creds2
;
234 if (principal
== NULL
) {
235 /* no way to delete if we don't know the principal */
241 /* not a kerberos connection */
246 /* We have already tried discarding the credentials */
252 ret
= krb5_parse_name(ccc
->smb_krb5_context
->krb5_context
, principal
, &creds
.server
);
257 ret
= krb5_cc_retrieve_cred(ccc
->smb_krb5_context
->krb5_context
, ccc
->ccache
, KRB5_TC_MATCH_SRV_NAMEONLY
, &creds
, &creds2
);
259 /* don't retry - we didn't find these credentials to remove */
260 krb5_free_cred_contents(ccc
->smb_krb5_context
->krb5_context
, &creds
);
264 ret
= krb5_cc_remove_cred(ccc
->smb_krb5_context
->krb5_context
, ccc
->ccache
, KRB5_TC_MATCH_SRV_NAMEONLY
, &creds
);
265 krb5_free_cred_contents(ccc
->smb_krb5_context
->krb5_context
, &creds
);
266 krb5_free_cred_contents(ccc
->smb_krb5_context
->krb5_context
, &creds2
);
268 /* don't retry - we didn't find these credentials to
269 * remove. Note that with the current backend this
270 * never happens, as it always returns 0 even if the
271 * creds don't exist, which is why we do a separate
272 * krb5_cc_retrieve_cred() above.
280 static int cli_credentials_new_ccache(struct cli_credentials
*cred
,
281 struct loadparm_context
*lp_ctx
,
283 struct ccache_container
**_ccc
,
284 const char **error_string
)
286 bool must_free_cc_name
= false;
288 struct ccache_container
*ccc
= talloc(cred
, struct ccache_container
);
293 ret
= cli_credentials_get_krb5_context(cred
, lp_ctx
,
294 &ccc
->smb_krb5_context
);
297 (*error_string
) = talloc_asprintf(cred
, "Failed to get krb5_context: %s",
301 if (!talloc_reference(ccc
, ccc
->smb_krb5_context
)) {
303 (*error_string
) = strerror(ENOMEM
);
308 must_free_cc_name
= true;
310 if (lpcfg_parm_bool(lp_ctx
, NULL
, "credentials", "krb5_cc_file", false)) {
311 ccache_name
= talloc_asprintf(ccc
, "FILE:/tmp/krb5_cc_samba_%u_%p",
312 (unsigned int)getpid(), ccc
);
314 ccache_name
= talloc_asprintf(ccc
, "MEMORY:%p",
320 (*error_string
) = strerror(ENOMEM
);
325 ret
= krb5_cc_resolve(ccc
->smb_krb5_context
->krb5_context
, ccache_name
,
328 (*error_string
) = talloc_asprintf(cred
, "failed to resolve a krb5 ccache (%s): %s\n",
330 smb_get_krb5_error_message(ccc
->smb_krb5_context
->krb5_context
,
332 talloc_free(ccache_name
);
337 if (strncasecmp(ccache_name
, "MEMORY:", 7) == 0) {
338 talloc_set_destructor(ccc
, free_mccache
);
340 talloc_set_destructor(ccc
, free_dccache
);
343 if (must_free_cc_name
) {
344 talloc_free(ccache_name
);
352 _PUBLIC_
int cli_credentials_get_named_ccache(struct cli_credentials
*cred
,
353 struct tevent_context
*event_ctx
,
354 struct loadparm_context
*lp_ctx
,
356 struct ccache_container
**ccc
,
357 const char **error_string
)
360 enum credentials_obtained obtained
;
362 if (cred
->machine_account_pending
) {
363 cli_credentials_set_machine_account(cred
, lp_ctx
);
366 if (cred
->ccache_obtained
>= cred
->ccache_threshold
&&
367 cred
->ccache_obtained
> CRED_UNINITIALISED
) {
369 bool expired
= false;
370 ret
= smb_krb5_cc_get_lifetime(cred
->ccache
->smb_krb5_context
->krb5_context
,
371 cred
->ccache
->ccache
, &lifetime
);
372 if (ret
== KRB5_CC_END
) {
373 /* If we have a particular ccache set, without
374 * an initial ticket, then assume there is a
376 } else if (ret
== 0) {
378 DEBUG(3, ("Ticket in credentials cache for %s expired, will refresh\n",
379 cli_credentials_get_principal(cred
, cred
)));
381 } else if (lifetime
< 300) {
382 DEBUG(3, ("Ticket in credentials cache for %s will shortly expire (%u secs), will refresh\n",
383 cli_credentials_get_principal(cred
, cred
), (unsigned int)lifetime
));
387 (*error_string
) = talloc_asprintf(cred
, "failed to get ccache lifetime: %s\n",
388 smb_get_krb5_error_message(cred
->ccache
->smb_krb5_context
->krb5_context
,
393 DEBUG(5, ("Ticket in credentials cache for %s will expire in %u secs\n",
394 cli_credentials_get_principal(cred
, cred
), (unsigned int)lifetime
));
401 if (cli_credentials_is_anonymous(cred
)) {
402 (*error_string
) = "Cannot get anonymous kerberos credentials";
406 ret
= cli_credentials_new_ccache(cred
, lp_ctx
, ccache_name
, ccc
, error_string
);
411 ret
= kinit_to_ccache(cred
, cred
, (*ccc
)->smb_krb5_context
, event_ctx
, (*ccc
)->ccache
, &obtained
, error_string
);
416 ret
= cli_credentials_set_from_ccache(cred
, *ccc
,
417 obtained
, error_string
);
420 cred
->ccache_obtained
= cred
->principal_obtained
;
424 cli_credentials_invalidate_client_gss_creds(cred
, cred
->ccache_obtained
);
428 _PUBLIC_
int cli_credentials_get_ccache(struct cli_credentials
*cred
,
429 struct tevent_context
*event_ctx
,
430 struct loadparm_context
*lp_ctx
,
431 struct ccache_container
**ccc
,
432 const char **error_string
)
434 return cli_credentials_get_named_ccache(cred
, event_ctx
, lp_ctx
, NULL
, ccc
, error_string
);
437 /* We have good reason to think the ccache in these credentials is invalid - blow it away */
438 static void cli_credentials_unconditionally_invalidate_client_gss_creds(struct cli_credentials
*cred
)
440 if (cred
->client_gss_creds_obtained
> CRED_UNINITIALISED
) {
441 talloc_unlink(cred
, cred
->client_gss_creds
);
442 cred
->client_gss_creds
= NULL
;
444 cred
->client_gss_creds_obtained
= CRED_UNINITIALISED
;
447 void cli_credentials_invalidate_client_gss_creds(struct cli_credentials
*cred
,
448 enum credentials_obtained obtained
)
450 /* If the caller just changed the username/password etc, then
451 * any cached credentials are now invalid */
452 if (obtained
>= cred
->client_gss_creds_obtained
) {
453 if (cred
->client_gss_creds_obtained
> CRED_UNINITIALISED
) {
454 talloc_unlink(cred
, cred
->client_gss_creds
);
455 cred
->client_gss_creds
= NULL
;
457 cred
->client_gss_creds_obtained
= CRED_UNINITIALISED
;
459 /* Now that we know that the data is 'this specified', then
460 * don't allow something less 'known' to be returned as a
461 * ccache. Ie, if the username is on the command line, we
462 * don't want to later guess to use a file-based ccache */
463 if (obtained
> cred
->client_gss_creds_threshold
) {
464 cred
->client_gss_creds_threshold
= obtained
;
468 /* We have good reason to think this CCACHE is invalid. Blow it away */
469 static void cli_credentials_unconditionally_invalidate_ccache(struct cli_credentials
*cred
)
471 if (cred
->ccache_obtained
> CRED_UNINITIALISED
) {
472 talloc_unlink(cred
, cred
->ccache
);
475 cred
->ccache_obtained
= CRED_UNINITIALISED
;
477 cli_credentials_unconditionally_invalidate_client_gss_creds(cred
);
480 _PUBLIC_
void cli_credentials_invalidate_ccache(struct cli_credentials
*cred
,
481 enum credentials_obtained obtained
)
483 /* If the caller just changed the username/password etc, then
484 * any cached credentials are now invalid */
485 if (obtained
>= cred
->ccache_obtained
) {
486 if (cred
->ccache_obtained
> CRED_UNINITIALISED
) {
487 talloc_unlink(cred
, cred
->ccache
);
490 cred
->ccache_obtained
= CRED_UNINITIALISED
;
492 /* Now that we know that the data is 'this specified', then
493 * don't allow something less 'known' to be returned as a
494 * ccache. i.e, if the username is on the command line, we
495 * don't want to later guess to use a file-based ccache */
496 if (obtained
> cred
->ccache_threshold
) {
497 cred
->ccache_threshold
= obtained
;
500 cli_credentials_invalidate_client_gss_creds(cred
,
504 static int free_gssapi_creds(struct gssapi_creds_container
*gcc
)
507 (void)gss_release_cred(&min_stat
, &gcc
->creds
);
511 _PUBLIC_
int cli_credentials_get_client_gss_creds(struct cli_credentials
*cred
,
512 struct tevent_context
*event_ctx
,
513 struct loadparm_context
*lp_ctx
,
514 struct gssapi_creds_container
**_gcc
,
515 const char **error_string
)
518 OM_uint32 maj_stat
, min_stat
;
519 struct gssapi_creds_container
*gcc
;
520 struct ccache_container
*ccache
;
521 #ifdef HAVE_GSS_KRB5_CRED_NO_CI_FLAGS_X
522 gss_buffer_desc empty_buffer
= GSS_C_EMPTY_BUFFER
;
524 krb5_enctype
*etypes
= NULL
;
526 if (cred
->client_gss_creds_obtained
>= cred
->client_gss_creds_threshold
&&
527 cred
->client_gss_creds_obtained
> CRED_UNINITIALISED
) {
528 bool expired
= false;
529 OM_uint32 lifetime
= 0;
530 gss_cred_usage_t usage
= 0;
531 maj_stat
= gss_inquire_cred(&min_stat
, cred
->client_gss_creds
->creds
,
532 NULL
, &lifetime
, &usage
, NULL
);
533 if (maj_stat
== GSS_S_CREDENTIALS_EXPIRED
) {
534 DEBUG(3, ("Credentials for %s expired, must refresh credentials cache\n", cli_credentials_get_principal(cred
, cred
)));
536 } else if (maj_stat
== GSS_S_COMPLETE
&& lifetime
< 300) {
537 DEBUG(3, ("Credentials for %s will expire shortly (%u sec), must refresh credentials cache\n", cli_credentials_get_principal(cred
, cred
), lifetime
));
539 } else if (maj_stat
!= GSS_S_COMPLETE
) {
540 *error_string
= talloc_asprintf(cred
, "inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
541 gssapi_error_string(cred
, maj_stat
, min_stat
, NULL
));
545 cli_credentials_unconditionally_invalidate_client_gss_creds(cred
);
547 DEBUG(5, ("GSSAPI credentials for %s will expire in %u secs\n",
548 cli_credentials_get_principal(cred
, cred
), (unsigned int)lifetime
));
550 *_gcc
= cred
->client_gss_creds
;
555 ret
= cli_credentials_get_ccache(cred
, event_ctx
, lp_ctx
,
556 &ccache
, error_string
);
558 if (cli_credentials_get_kerberos_state(cred
) == CRED_MUST_USE_KERBEROS
) {
559 DEBUG(1, ("Failed to get kerberos credentials (kerberos required): %s\n", *error_string
));
561 DEBUG(4, ("Failed to get kerberos credentials: %s\n", *error_string
));
566 gcc
= talloc(cred
, struct gssapi_creds_container
);
568 (*error_string
) = error_message(ENOMEM
);
572 maj_stat
= gss_krb5_import_cred(&min_stat
, ccache
->ccache
, NULL
, NULL
,
574 if ((maj_stat
== GSS_S_FAILURE
) && (min_stat
== (OM_uint32
)KRB5_CC_END
|| min_stat
== (OM_uint32
) KRB5_CC_NOTFOUND
)) {
575 /* This CCACHE is no good. Ensure we don't use it again */
576 cli_credentials_unconditionally_invalidate_ccache(cred
);
578 /* Now try again to get a ccache */
579 ret
= cli_credentials_get_ccache(cred
, event_ctx
, lp_ctx
,
580 &ccache
, error_string
);
582 DEBUG(1, ("Failed to re-get CCACHE for GSSAPI client: %s\n", error_message(ret
)));
586 maj_stat
= gss_krb5_import_cred(&min_stat
, ccache
->ccache
, NULL
, NULL
,
598 (*error_string
) = talloc_asprintf(cred
, "gss_krb5_import_cred failed: %s", error_message(ret
));
604 * transfer the enctypes from the smb_krb5_context to the gssapi layer
606 * We use 'our' smb_krb5_context to do the AS-REQ and it is possible
607 * to configure the enctypes via the krb5.conf.
609 * And the gss_init_sec_context() creates it's own krb5_context and
610 * the TGS-REQ had all enctypes in it and only the ones configured
611 * and used for the AS-REQ, so it wasn't possible to disable the usage
614 min_stat
= get_kerberos_allowed_etypes(ccache
->smb_krb5_context
->krb5_context
,
617 OM_uint32 num_ktypes
;
619 for (num_ktypes
= 0; etypes
[num_ktypes
]; num_ktypes
++);
621 maj_stat
= gss_krb5_set_allowable_enctypes(&min_stat
, gcc
->creds
,
632 (*error_string
) = talloc_asprintf(cred
, "gss_krb5_set_allowable_enctypes failed: %s", error_message(ret
));
637 #ifdef HAVE_GSS_KRB5_CRED_NO_CI_FLAGS_X
639 * Don't force GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG.
641 * This allows us to disable SIGN and SEAL on a TLS connection with
642 * GSS-SPNENO. For example ldaps:// connections.
644 * https://groups.yahoo.com/neo/groups/cat-ietf/conversations/topics/575
645 * http://krbdev.mit.edu/rt/Ticket/Display.html?id=6938
647 maj_stat
= gss_set_cred_option(&min_stat
, &gcc
->creds
,
648 GSS_KRB5_CRED_NO_CI_FLAGS_X
,
657 (*error_string
) = talloc_asprintf(cred
, "gss_set_cred_option failed: %s", error_message(ret
));
661 cred
->client_gss_creds_obtained
= cred
->ccache_obtained
;
662 talloc_set_destructor(gcc
, free_gssapi_creds
);
663 cred
->client_gss_creds
= gcc
;
669 Set a gssapi cred_id_t into the credentials system. (Client case)
671 This grabs the credentials both 'intact' and getting the krb5
672 ccache out of it. This routine can be generalised in future for
673 the case where we deal with GSSAPI mechs other than krb5.
675 On sucess, the caller must not free gssapi_cred, as it now belongs
676 to the credentials system.
679 int cli_credentials_set_client_gss_creds(struct cli_credentials
*cred
,
680 struct loadparm_context
*lp_ctx
,
681 gss_cred_id_t gssapi_cred
,
682 enum credentials_obtained obtained
,
683 const char **error_string
)
686 OM_uint32 maj_stat
, min_stat
;
687 struct ccache_container
*ccc
;
688 struct gssapi_creds_container
*gcc
;
689 if (cred
->client_gss_creds_obtained
> obtained
) {
693 gcc
= talloc(cred
, struct gssapi_creds_container
);
695 (*error_string
) = error_message(ENOMEM
);
699 ret
= cli_credentials_new_ccache(cred
, lp_ctx
, NULL
, &ccc
, error_string
);
704 maj_stat
= gss_krb5_copy_ccache(&min_stat
,
705 gssapi_cred
, ccc
->ccache
);
713 (*error_string
) = error_message(ENOMEM
);
718 ret
= cli_credentials_set_from_ccache(cred
, ccc
, obtained
, error_string
);
721 cred
->ccache_obtained
= obtained
;
723 gcc
->creds
= gssapi_cred
;
724 talloc_set_destructor(gcc
, free_gssapi_creds
);
726 /* set the clinet_gss_creds_obtained here, as it just
727 got set to UNINITIALISED by the calls above */
728 cred
->client_gss_creds_obtained
= obtained
;
729 cred
->client_gss_creds
= gcc
;
734 /* Get the keytab (actually, a container containing the krb5_keytab)
735 * attached to this context. If this hasn't been done or set before,
736 * it will be generated from the password.
738 _PUBLIC_
int cli_credentials_get_keytab(struct cli_credentials
*cred
,
739 struct loadparm_context
*lp_ctx
,
740 struct keytab_container
**_ktc
)
743 struct keytab_container
*ktc
;
744 struct smb_krb5_context
*smb_krb5_context
;
745 const char *keytab_name
;
749 if (cred
->keytab_obtained
>= (MAX(cred
->principal_obtained
,
750 cred
->username_obtained
))) {
751 *_ktc
= cred
->keytab
;
755 if (cli_credentials_is_anonymous(cred
)) {
759 ret
= cli_credentials_get_krb5_context(cred
, lp_ctx
,
765 mem_ctx
= talloc_new(cred
);
770 ret
= smb_krb5_create_memory_keytab(mem_ctx
,
771 smb_krb5_context
->krb5_context
,
772 cli_credentials_get_password(cred
),
773 cli_credentials_get_username(cred
),
774 cli_credentials_get_realm(cred
),
775 cli_credentials_get_kvno(cred
),
776 &keytab
, &keytab_name
);
778 talloc_free(mem_ctx
);
782 ret
= smb_krb5_get_keytab_container(mem_ctx
, smb_krb5_context
,
783 keytab
, keytab_name
, &ktc
);
785 talloc_free(mem_ctx
);
789 cred
->keytab_obtained
= (MAX(cred
->principal_obtained
,
790 cred
->username_obtained
));
792 /* We make this keytab up based on a password. Therefore
793 * match-by-key is acceptable, we can't match on the wrong
795 ktc
->password_based
= true;
797 talloc_steal(cred
, ktc
);
799 *_ktc
= cred
->keytab
;
800 talloc_free(mem_ctx
);
804 /* Given the name of a keytab (presumably in the format
805 * FILE:/etc/krb5.keytab), open it and attach it */
807 _PUBLIC_
int cli_credentials_set_keytab_name(struct cli_credentials
*cred
,
808 struct loadparm_context
*lp_ctx
,
809 const char *keytab_name
,
810 enum credentials_obtained obtained
)
813 struct keytab_container
*ktc
;
814 struct smb_krb5_context
*smb_krb5_context
;
817 if (cred
->keytab_obtained
>= obtained
) {
821 ret
= cli_credentials_get_krb5_context(cred
, lp_ctx
, &smb_krb5_context
);
826 mem_ctx
= talloc_new(cred
);
831 ret
= smb_krb5_get_keytab_container(mem_ctx
, smb_krb5_context
,
832 NULL
, keytab_name
, &ktc
);
837 cred
->keytab_obtained
= obtained
;
839 talloc_steal(cred
, ktc
);
841 talloc_free(mem_ctx
);
846 /* Get server gss credentials (in gsskrb5, this means the keytab) */
848 _PUBLIC_
int cli_credentials_get_server_gss_creds(struct cli_credentials
*cred
,
849 struct loadparm_context
*lp_ctx
,
850 struct gssapi_creds_container
**_gcc
)
853 OM_uint32 maj_stat
, min_stat
;
854 struct gssapi_creds_container
*gcc
;
855 struct keytab_container
*ktc
;
856 struct smb_krb5_context
*smb_krb5_context
;
858 krb5_principal princ
;
859 const char *error_string
;
860 enum credentials_obtained obtained
;
862 mem_ctx
= talloc_new(cred
);
867 ret
= cli_credentials_get_krb5_context(cred
, lp_ctx
, &smb_krb5_context
);
872 ret
= principal_from_credentials(mem_ctx
, cred
, smb_krb5_context
, &princ
, &obtained
, &error_string
);
874 DEBUG(1,("cli_credentials_get_server_gss_creds: making krb5 principal failed (%s)\n",
876 talloc_free(mem_ctx
);
880 if (cred
->server_gss_creds_obtained
>= (MAX(cred
->keytab_obtained
, obtained
))) {
881 talloc_free(mem_ctx
);
882 *_gcc
= cred
->server_gss_creds
;
886 ret
= cli_credentials_get_keytab(cred
, lp_ctx
, &ktc
);
888 DEBUG(1, ("Failed to get keytab for GSSAPI server: %s\n", error_message(ret
)));
892 gcc
= talloc(cred
, struct gssapi_creds_container
);
894 talloc_free(mem_ctx
);
898 if (ktc
->password_based
|| obtained
< CRED_SPECIFIED
) {
899 /* This creates a GSSAPI cred_id_t for match-by-key with only the keytab set */
900 maj_stat
= gss_krb5_import_cred(&min_stat
, NULL
, NULL
, ktc
->keytab
,
903 /* This creates a GSSAPI cred_id_t with the principal and keytab set, matching by name */
904 maj_stat
= gss_krb5_import_cred(&min_stat
, NULL
, princ
, ktc
->keytab
,
915 cred
->server_gss_creds_obtained
= cred
->keytab_obtained
;
916 talloc_set_destructor(gcc
, free_gssapi_creds
);
917 cred
->server_gss_creds
= gcc
;
920 talloc_free(mem_ctx
);
928 _PUBLIC_
void cli_credentials_set_kvno(struct cli_credentials
*cred
,
935 * Return Kerberos KVNO
938 _PUBLIC_
int cli_credentials_get_kvno(struct cli_credentials
*cred
)
944 const char *cli_credentials_get_salt_principal(struct cli_credentials
*cred
)
946 return cred
->salt_principal
;
949 _PUBLIC_
void cli_credentials_set_salt_principal(struct cli_credentials
*cred
, const char *principal
)
951 talloc_free(cred
->salt_principal
);
952 cred
->salt_principal
= talloc_strdup(cred
, principal
);
955 /* The 'impersonate_principal' is used to allow one Kerberos principal
956 * (and it's associated keytab etc) to impersonate another. The
957 * ability to do this is controlled by the KDC, but it is generally
958 * permitted to impersonate anyone to yourself. This allows any
959 * member of the domain to get the groups of a user. This is also
960 * known as S4U2Self */
962 _PUBLIC_
const char *cli_credentials_get_impersonate_principal(struct cli_credentials
*cred
)
964 return cred
->impersonate_principal
;
968 * The 'self_service' is the service principal that
969 * represents the same object (by its objectSid)
970 * as the client principal (typically our machine account).
971 * When trying to impersonate 'impersonate_principal' with
974 _PUBLIC_
const char *cli_credentials_get_self_service(struct cli_credentials
*cred
)
976 return cred
->self_service
;
979 _PUBLIC_
void cli_credentials_set_impersonate_principal(struct cli_credentials
*cred
,
980 const char *principal
,
981 const char *self_service
)
983 talloc_free(cred
->impersonate_principal
);
984 cred
->impersonate_principal
= talloc_strdup(cred
, principal
);
985 talloc_free(cred
->self_service
);
986 cred
->self_service
= talloc_strdup(cred
, self_service
);
987 cli_credentials_set_kerberos_state(cred
, CRED_MUST_USE_KERBEROS
);
991 * when impersonating for S4U2proxy we need to set the target principal.
992 * Similarly, we may only be authorized to do general impersonation to
993 * some particular services.
995 * Likewise, password changes typically require a ticket to kpasswd/realm directly, not via a TGT
997 * NULL means that tickets will be obtained for the krbtgt service.
1000 const char *cli_credentials_get_target_service(struct cli_credentials
*cred
)
1002 return cred
->target_service
;
1005 _PUBLIC_
void cli_credentials_set_target_service(struct cli_credentials
*cred
, const char *target_service
)
1007 talloc_free(cred
->target_service
);
1008 cred
->target_service
= talloc_strdup(cred
, target_service
);